Tom's right, RCA's and probably others won't work with the yoke disconnected. I made an octal jumper plug to replace the yoke when I run sets on the bench, just for that reason. You can make one yourself, just break any useless octal tube and harvest the socket. Remove the remnants of the old lead wires, and jumper pins 3 and 7 together. Works on all RCA chassis CTC-2 through CTC-5. CTC-7 and later had spade connectors for the yoke, so the horizontal sections will run without jumpering anything.
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Evolution...
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